Updated 6:50 PM | State Del. Barbara Comstock defeated five other candidates Saturday to win the GOP nomination for a competitive House race in northern Virginia, according to multiple sources.

The GOP chairman of Virgina's 10th District, which ran the "firehouse primary," confirmed the results.

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Comstock will face Fairfax County Supervisor John Foust, a Democrat, in November to succeed retiring Rep. Frank R. Wolf, R-Va.. The seat is a top target for national Democrats. Mitt Romney carried the district by a 1-point margin in 2012.

In Virginia, the local party within a congressional district selects the method for choosing the party’s nominee in an open-seat contest. The local party picked a "firehouse primary," held more than a month before the state's regularly scheduled primaries, that consisted of 10 polling locations in counties throughout the district, with polls open from 10 a.m. until 3 p.m.

Democrats initially scheduled a convention to choose their nominee, but canceled it when all of other candidates dropped out, making Foust the nominee.